THE PURPOSE OF PREACHING IS TO PRODUCE GODLY PERSONALITIES, WHO ARE DRIVEN BY THE SPIRIT OF CHRIST AND HIS WORD, (ie, a personality fit for spending eternity in Heaven). Therefore, the prime concern of the clergy including the Prophets, in this sense, is to open the eyes of the Church members, and to turn them from darkness to light, and from the power of Satan unto God, that they may receive forgiveness of sins, and inheritance among them which are sanctified by faith that is in me.(Acts 26:18)
John 8: 31- 34 Then said Jesus to those Jews which believed on Him, If ye continue in my Word, then are ye my disciples indeed; And ye shall know the truth and the truth shall make you free. They answered Him, we be Abraham's seed, and were never in bondage to any man: How sayest Thou, Ye shall be made free? Jesus answered them, Verily, verily, I say unto you, Whosoever committeth sin is the servant of sin.